Crush the cookies in food processor or blender.
melt butter and add to cookies. Use this for the crust on your cake.
Press 1/2 of cookie crust into 9x13 cake pan
Top crust with one ice cream
Spread with another layer of cookie crumbs
add half the chocolate or caramel topping
Add final layer of ice cream
add cool whip topping
Drizzle remaining chocolate or caramel topping over cool whip.
Freeze overnight or until firm